# use this macro inside of a while(true) loop it breaks when the iterator is over
# e.g. this prints all key values in the map
# while(true) 
#   map_iterator_break(myiterator)
#   message("${myiterator.key} = ${myiterator.value}")
# endwhile()
macro(map_iterator_break it_ref)
  map_iterator_next(${it_ref})
  if("${it_ref}.end")
    break()
  endif()
endmacro()